How to scan pages from the automatic document feeder (ADF) of TWAIN scanner?

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DocumentFeeder class allows to control the document feeder of TWAIN device.

Here is an example that demonstrates how to use document feeder of TWAIN device:

/// <summary>
/// Acquire images from the document feeder.
/// </summary>
public void AcquireImagesFromAdf(Vintasoft.Twain.Device device)
{
    // disable UI
    device.ShowUI = false;

    // open the device
    device.Open();
    // specify that color images must be acquired
    device.PixelType = Vintasoft.Twain.PixelType.RGB;
    // set the inches as unit of measure
    device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches;
    // set the desired resolution of acquired images
    device.Resolution = new Vintasoft.Twain.Resolution(200f, 200f);

    // if device has feeder
    if (device.HasFeeder)
    {
        // enable feeder
        device.DocumentFeeder.Enabled = true;
        // specify that application want to acquire all pages from the feeder
        device.XferCount = -1;

        // if pages can be scanned in duplex mode
        if (device.DocumentFeeder.DuplexMode != Vintasoft.Twain.DuplexMode.None)
            // enable duplex scanning
            device.DocumentFeeder.DuplexEnabled = true;

        // if feeder can detect paper
        if (device.DocumentFeeder.PaperDetectable)
        {
            // if feeder is loaded
            if (device.DocumentFeeder.Loaded)
                // acquire images asynchronously
                device.Acquire();
        }
        // if feeder cannot detect paper
        else
            // acquire images asynchronously
            device.Acquire();
    }
}

VB.NET

''' <summary>
''' Acquire images from the document feeder.
''' </summary>
Public Sub AcquireImagesFromAdf(device As Vintasoft.Twain.Device)
        ' disable UI
        device.ShowUI = False

        ' open the device
        device.Open()
        ' specify that color images must be acquired
        device.PixelType = Vintasoft.Twain.PixelType.RGB
        ' set the inches as unit of measure
        device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches
        ' set the desired resolution of acquired images
        device.Resolution = New Vintasoft.Twain.Resolution(200F, 200F)

        ' if device has feeder
        If device.HasFeeder Then
                ' enable feeder
                device.DocumentFeeder.Enabled = True
                ' specify that application want to acquire all pages from the feeder
                device.XferCount = -1

                ' if pages can be scanned in duplex mode
                If device.DocumentFeeder.DuplexMode <> Vintasoft.Twain.DuplexMode.None Then
                        ' enable duplex scanning
                        device.DocumentFeeder.DuplexEnabled = True
                End If

                ' if feeder can detect paper
                If device.DocumentFeeder.PaperDetectable Then
                        ' if feeder is loaded
                        If device.DocumentFeeder.Loaded Then
                                ' acquire images asynchronously
                                device.Acquire()
                        End If
                Else
                        ' if feeder cannot detect paper
                        ' acquire images asynchronously
                        device.Acquire()
                End If
        End If
End Sub

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